Combined transit and gravity level.



No. 642,203. Patented Jan. 30, I900. F. C. BROWN.

COMBINED TRANSIT AND GRAVITY LEVEL.

(Application filed Mar. 17, 1899.

(No Model.)

Mia/we rap STATES PATENT OFFICE.

FRANK C. BROIVN, OF LOVELAND, COLORADO, ASSIGNOR TO JOHN BEAL AND OSCAR J. SMITH, OF BERTHOUD, COLORADO.

"COMBINED TRANSIT AND GRAVITY LEVEL.

SPECIFICATION forming part of Letters Patent No. 642,203, dated January 30, 1900.

Application filed March 17, 1899. Serial No. 709,421. (No model.)

To (LZZ whmn it may concern:

Beit known that I, FRANK 0. BROWN, a citizen of the United States of America, residing at Iioveland, in the county of Larimer and State of Colorado, have invented certain new and useful Improvements in a Combined Transit and Gravity Level; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

My invention relates to an improved transit and gravity level, my object being to provide an apparatus of this class which shall be simple in construction, economical in cost, and reliable, durable, and efficient in use; and to these ends the invention consists of the features hereinafter described and claimed, all of which will be fully understood by reference to the accompanying drawings, in which is illustrated an embodiment thereof.

In the drawings, Figure 1 is a side View of my improved instrument, partly in section, taken on the line X X, Figs. 2 and 3. Fig. 2 is a top view with the telescope removed. Fig. 3 is an underneath View of the same.

Similar reference characters indicating corresponding parts in the views, let the numeral 5 designate a casing provided with apertured lugs 5, to which are attached the supporting-tripod legs. 6. The body portion of the casing 5 is cylindrical and connected with the top part 7 by means of sloping arms 8. The top part 7 is provided with an opening, in which is pivoted at two diametrically opposite points a disk 9. This disk is provided with a central opening, in which is pivotally hung a rod 10. The pivots of the rod are placed at opposite points on a line at right angles to the line or axis of the disk-pivots. The openings in which the disk and rod are respectively located are of sufficient size to enable said parts to swing or vibrate freely. The rod 10 projects above the disk 9 and is fashioned to fit a socket formed in a depending lug 12, attached to a bar 13, upon which the telescope 14 is mounted. The rod projects considerably below the disk 9, its lower extremity being provided with an enlargement 10, forming a weight of sufficient gravity to cause the rod when unobstructed to assume readily a vertical position. The bottom of the casing 5 is provided with a central opening 5, immediately above which the weighted end of the rod is located when the rod is in the perpendicular position.

To the bottom 5 of the casing is attached one extremity of a leaf-spring 15, which extends directly across the opening 5, its opposite extremity being bent downwardly, as shown at 15, to facilitate the manipulation of the spring. To the center of this spring is attached a button 16, which projects upwardly into the opening 5 to engagement with the weighted extremity of the rod 10. The function of this spring and the button is to lock the rod in the vertical position by pressing on its weighted extremity. When the spring is pressed downwardly, the rod is allowed to vibrate freely. When it has reached the desired position, the spring is allowed to return to its normal position and the button into locking engagement with the weight.

Having thus described my invention, what I claim is 1. In a transit and gravity level, the combination of a suitable supporting frame or casing, of a weighted rod mounted to vibrate freely therein, its upper extremity being fashioned to support a telescope, and a spring attached to the casing and adapted to engage the weighted extremity of the rod for locking the latter in the desired position.

2. The combination with the casing having openings in its top and bottom respectively, a disk located in the top opening and pivoted at two diametrically opposite points, a rod inserted in an opening formed in the diskand pivoted therein at points in a line at right angles to the pivotal axis of the disk, said rod projecting above the disk sufficiently to form a support for the telescope, or other inand located just above the opening in the In testimony whereof I aflix mysignature in presence of two witnesses.

I FRANK 0. BROWN.

Witnesses:

bottom of the casing, a looking-spring attached to the bottom of the casing and extending across the opening therein, and a button or projection attached to said spring 5 and adapted to project upwardly into the bottom opening to engagementwith the Weighted A. J. OBRIEN, end of the vibrating rod. V NELLIE G. DANIELS. 

